How to configure state in ionic blank app?

I cretaed a new ionic blank app intuit there are two html pages: 1 index.html and a category.html. I configured the states and then added controller in app.js file but it is not working.

This is my state configurations:

.config(function($stateProvider, $urlRouterProvider) {
    $stateProvider
        .state('camera',{
            url:"/camera",
            cache: false,
            controller:"CameraCtrl",
            templateUrl:'index.html'
        })
        .state('category', {
            url: "/category",
            templateUrl: "category.html",
            controller: 'CategoryCtrl'
        })

    // if none of the above states are matched, use this as the fallback

    $urlRouterProvider.otherwise('/camera');

})

And this is my controller:

.controller('CameraCtrl',function($scope,$state){
  $scope.menu = function() {
    console.log('yesytest');
      $state.go('category');
      // window.location = "category.html";
  };

})

This is my app.js. Is anything wrong here?

Unfortunately I only had 15 minutes to mock this together, Let me know if this works for you and if you need any further assistance drop me a response.

Controller

var example = angular.module('starter', ['ionic', 'starter.controllers',]);

example.config(function($stateProvider, $urlRouterProvider) {
  $stateProvider
    .state('tab', {
    url: "/tab",
    abstract: true,
    templateUrl: "templates/tabs.html"
  })                                   
  .state('tab.home', {
    url: '/home',
    views: {
      'home': {
        templateUrl: 'templates/home.html'
      }
    }
  })                                  
  .state('tab.camera', {
    url: '/camera',
    views: {
      'camera': {
        templateUrl: 'templates/camera.html'
      }
    }
  })                                    
  .state('tab.category', {
    url: '/category',
    views: {
      'category': {
        templateUrl: 'templates/category.html'
      }
    }
  });
  $urlRouterProvider.otherwise('/tab/home');
});

>>> Working Example <<<